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박진혁(Jinhyuk Park),강제원(Je-Won Kang),최승복(Seung-Bok Choi) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.2
A prosthetic knee for above-knee (AK) amputee is categorized into passive and active type. The passive prosthetic knee is generally made by elastic material. Although AK amputee can easily walk by using passive prosthetic leg, knee joint motions are not similar to ordinary persons. The active prosthetic leg can control the knee angle owing to the actuator and microprocessor. However, the active type is not cost-effective and the stability may be lost due to the malfunction of sensors. In order to resolve these disadvantages of passive and active type, a semi-active prosthetic knee which can control the knee angle is proposed in this work. The proposed semi-active one requires a less input energy but provides active type performance. In order to achieve this goal, in this work, a semi-active prosthetic knee using magneto-rheological (MR) damper for AK amputees is designed. The MR damper can support the weight of body by using less energy than actuator of active prosthetic. It can control knee angle by inducing the magnetic field at the time of stance phase. This salient characteristic is evaluated and presented in this work.
반도체 스테이지용 복합모드 MR 마운트의 제어 성능 평가
최승복(Seung-Bok Choi),박진혁(Jinhyuk Park),김평화(Pyung-Hwa Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
This paper presents experimental performance evaluation of a coupled mode MR(magnetorheological) mount for semiconductor manufacturing stage. The vibration sources of semi-conductor manufacturing stage can be categorized into two types, the vibration from the floor and the transient vibration during manufacturing. In this research, the coupled mode MR mount, which can control the environment vibration from floor and the transient vibration is manufactured. In order that MR mount can be applied into semi-conductor manufacturing stage, the coupled mode MR mount should be evaluated. The damping force of MR mount are measured in various exiting frequency and the response time is measured by experiment. Consequently, the response time of MR mount is fast and the control range of damping force is large. But, a phase delay of damping force will have to be modified.
최승복(Seung Bok Choi),김완호(Wan Ho Kim),박진혁(Jinhyuk Park),칼루반 수레쉬(Kaluvan Suresh) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
A novel Permanent Magnet based Magneto Rheological (PM-MR) damper is proposed in this paper. The principle of proposed MR damper is achieved by designing a linearly varying magnetization area with-respect to the movable permanent magnetic based piston setup. Nowadays, commercially available MR damper uses electromagnetic coils for generating the variable magnetic fields corresponding to the variable damping force. The amount of magnetic field produced by the electromagnetic coils are depends on the biasing current of voltage source. The key enabling concept of the proposed MR damper is to replace the electromagnetic coils and the voltage sources by utilizing the variable area based permanent magnetic piston setup. The proposed unique design structure of PM-MR damper has an increasing shear mode damping force with the piston movement in both jounce and rebound motion. In this research, analytical model of the proposed structure is derived and the structural design of proposed concept is verified using numerical CAD tool. As a result, the damping force is increase when piston movement in both jounce and rebound motion.